Molecules are defined as the smallest particles of a chemical compound or an element, and are made up of atoms. Cells are made up of semi permiable membranes that only allow selected materials to move in or out of the cell, therefore due to the big size of molecules compared to atoms the membrane doesn't allow their passage in the cell. Therefore the cell doesn't allow most molecules to diffuse passively to the cell. Secondly, molecules that can enter the cell requires specific carriers carriers that will enable entry of small molecules in the cell.

5 0

3 years ago

A DNA molecule produced by combining DNA from different sources is known as

Digiron [165]

Answer:

A DNA molecule produced by combining DNA from different sources is known as recombinant DNA.

Explanation:

Recombinant DNA (rDNA) can be obtained by coupling DNA fragments from different sources, a process that is performed at the restriction site level and uses enzymes.

Once rDNA has been designed —cutting out fragments of DNA that are then reassembled— it must be brought to a specific location in the cells, to be copied and expressed, using means of transport called vectors.

DNA recombination is performed in biotechnology laboratories specialized in the manipulation of genetic material.

The other options are not correct because:

Mutant or mutated DNA is a DNA molecule with an alteration of its nitrogenous base sequence
Hybrid DNA is a variant of recombiant DNA, in which only two DNA molecules from different sources are used.
Polyploid refers to cells containing the genome of different species.

8 0

2 years ago

Almost any chemical can be harmful if

kupik [55]

I would say the answer is b but all of the answer choices could be the correct answer(hope that helps)

7 0

3 years ago